/**
 * 基于多个state对象的计算属性
 */
export default{
    totalCount(state){
        return state.cartFoods.reduce((preTotal,food)=>preTotal+food.count,0);
    },
    totalPrice(state){
        return state.cartFoods.reduce((preTotal,food)=>preTotal+food.price*food.count,0)
    },
    positiveSize(state){
        return state.ratings.reduce((preTotal,rating)=>preTotal+(rating.rateType===0?1:0),0)
    }
}